How to play roll the ball?

If you are a huge fan of puzzle games, you probably know roll the ball. It is a popular game that has been played over 1000 million times.
This game is a great choice to test your brain. How to play roll the ball?
In this game, players need to use mouse to drag blocks, put them all to the right place, and create a path for the ball to get through. There are 15 challenging levels.
If you complete your goal in less moves, you will get more stars and bonuses